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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Measurements [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
                 
    Quoted Prices in Active Markets for
Identical Assets (Level 1)
As of December 31,
 
    2011     2010  

Assets:

               

Investment in marketable equity securities(1)

  $ 8.4     $ 18.0  

 

 

(1) Investment in marketable equity securities is recorded in Other Assets, net in the accompanying Consolidated Balance Sheets.
Other Fair Value Measurements
                 
    As of December 31,  
    2011     2010  

Long-term debt(1)

  $ 256.3     $ 114.6  

Senior unsecured notes

    207.0       203.0  

 

 

(1) Long-term debt includes our domestic revolving credit facility, capital lease obligations, and any related current maturities.